666 Proceedings of the Royal Society 
were once sea lochs, just as are Lochs Nevis and Hourn at the 
present day. These marks are frequent throughout the Highlands. 
I have seen similar gravel-heds along streams in several other glens. 
“ Whether it will he decided to survey the shelf, I cannot say. 
But there is nothing definite except the hit in Glen Rossdale; and 
a surveyor would not find it easy, when on the hillside, to know 
what mounds he should show, unless he had previously run a 
contour at the required height. 
“ I have made two sketches, one of Glenheg looking east, another 
of Glen Rossdale looking west, which I shall he happy to show 
you.” 
With reference to these last remarks by Captain Burke, it occurs 
to the Committee to express an opinion that, when the Ordnance 
surveyors discover on the hill sides terraces of the kind referred to, 
there should he some record given of them on the maps, accom- 
panied by a contour line at the same level along the adjoining hills, 
so that it might he seen whether there are separate patches of 
gravel elsewhere at the same height. It is also desirable that when 
the officer at the head of the Survey verifies what the surveyors have 
found, and makes sketches of the terraces, these sketches should he 
given with the maps when published. 
In walking down Glen Bossdale valley, on the right bank, the 
Convener fell in with a large mass of detritus, cut up into a series 
of knolls by the action of streams and rain. The height of these knolls 
above the sea was on an average 858 feet — agreeing pretty nearly 
with the level of the shelf already noticed as existing on the oppo- 
site side of the valley. 
These remains of gravel in Glen Rossdale and the adjoining glens, 
looking to the height and the form in which they occur, seem 
conclusive as to the occupation of these valleys by the sea ; and they 
confirm the inference derived from the position of the boulders, that 
the boulders were probably floated into these positions. 
The Convener was at first puzzled to account for the circumstance 
that most of the large boulders which he saw in these valleys were 
not upon drift, but upon bare rock ; and in many other parts of the 
country, the same thing occurs. If these boulders were floated by 
ice and thrown down, they must most generally have fallen upon the 
detrital beds then forming the sea-bottom, and not upon bare 
